DSK wrote:

Navvie wrote:


From: http://www.djaerotech.com/dj_askjd/d.../wingfin1.html


This is from a model airplane web site, and some of the terminology for
hydrodynamics is rather different. For one thing, we don't talk about the
"helix angle" of underwater foils. For another, attempting to get a net
forward (or windward) lift component from keel winglets isn't going to work
because they have to sail on both tacks.


Yep, that's why they are on both sides.

Cheers